Feces pumping and discharging system

ABSTRACT

A system for extracting and discharging fecal sludge, including: a pneumatic pressure conveyor, the pneumatic pressure conveyor including an air inlet and an air outlet; a pipe tee; a first two-position three-way valve; a second two-position three-way valve; and a plurality of connecting pipes, the pipes including an air vent pipe. The pneumatic pressure conveyor, the air inlet thereof, the air outlet thereof, the pipe tee, the second two-position three-way valve, and the first two-position three-way valve are connected via the connecting pipes to form a loop. The pipe tee is disposed close to the air inlet of the pneumatic pressure conveyor, and one port of the pipe tee not enclosed in the loop functions as an air inlet end of the pneumatic pressure conveyor.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a continuation-in-part of International Patent Application No. PCT/CN2012/074720 with an international filing date of Apr. 26, 2012, and is also a continuation-in-part of International Patent Application No. PCT/CN2012/074716 with an international filing date of Apr. 26, 2012, designating the United States, now pending, and further claims priority benefits to Chinese Patent Application No. 201110116214.1 filed Apr. 26, 2011, and to Chinese Patent Application No. 201110116211.8 filed Apr. 26, 2011, respectively. The contents of all of the aforementioned applications, including any intervening amendments thereto, are incorporated herein by reference. Inquiries from the public to applicants or assignees concerning this document or the related applications should be directed to: Matthias Scholl P.C., Attn.: Dr. Matthias Scholl Esq., 14781 Memorial Drive, Suite 1319, Houston, Tex. 77079.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The invention relates to a system for extracting and discharging fecal sludge.

2. Description of the Related Art

A typical device for extracting and disposing fecal sludge is a fecal sludge extracting vacuum truck, and the vacuum truck has the following shortages:

1. Core equipment of the vacuum truck for extracting fecal sludge is a vacuum pump, and the vacuum truck includes: an oil-gas separator, a liquid-gas separator, a rough filter, an anti-overflow valve, and a vacuum gauge. Thus, the vacuum truck is complex.

2. The extraction depth for the fecal sludge rarely exceeds 7 m, which is not suitable to enlarge the storage scale.

3. When extracting the fecal sludge, the carrying tank operates in a vacuum state, so that the tank body is required to have high compressive strength, thereby imposing high requirements on the material and the extraction process.

4. The vacuum pump is only capable of continuously operating for a short time, and the maintenance thereof is highly required.

5. The process of the fecal sludge extraction is complicated.

6. The closed storage device is not able to extract the fecal sludge by air pressure.

SUMMARY OF THE INVENTION

In view of the above-described problems, it is one objective of the invention to provide a system for extracting and discharging fecal sludge. The system solves problems existing in the fecal storage device during the fecal sludge extraction by pressured air and the forced fecal sludge discharge.

To achieve the above objective, in accordance with one embodiment of the invention, there is provided a system for extracting and discharging fecal sludge by pressured air controlled by two-position three-way valves. The system comprises: a truck body, the truck body comprising a rear and two sides; a carrying tank, the carrying tank comprising an inner cavity, a top, and a bottom comprising a fecal sludge outlet; a fecal extraction pipe; a fecal discharge valve; an observation widow or an observation tube; an anti-overflow device; a transmission shaft; a power take-off; an alarm device for warning a full-load of the fecal sludge; a pneumatic pressure conveyor, the pneumatic pressure conveyor comprising an air inlet and an air outlet; a pipe tee; a first two-position three-way valve; a second two-position three-way valve; and a plurality of connecting pipes, the connecting pipes comprising an air vent pipe. The pneumatic pressure conveyor, the air inlet thereof, the air outlet thereof, the pipe tee, the second two-position three-way valve, and the first two-position three-way valve are connected via the connecting pipes to form a loop. The pipe tee is disposed close to the air inlet of the pneumatic pressure conveyor, and one port of the pipe tee not enclosed in the loop functions as an air inlet end of the pneumatic pressure conveyor. The second two-position three-way valve is disposed close to the air outlet of the pneumatic pressure conveyor, and one end of the second two-position three-way valve not enclosed in the loop is connected to the air vent pipe. A free end of the air vent pipe functions as an air outlet end of the pneumatic pressure conveyor; and the air outlet end of the pneumatic pressure conveyor is fixed on a rear or either side of the truck body. The air outlet end of the pneumatic pressure conveyor is connected to the air vent pipe. One end of the first two-position three-way valve not enclosed in the loop communicates with an inner cavity of the carrying tank from the top thereof via the connecting pipe. The top of the carrying tank is provided with the fecal extraction pipe communicating with the carrying tank, and the fecal sludge outlet is arranged at the bottom of the carrying tank.

In accordance with another embodiment of the invention, there is provided a system for extracting and discharging fecal sludge by pressured air controlled by two-position three-way valves, the system comprises: a pneumatic pressure conveyor, the pneumatic pressure conveyor comprising an air inlet and an air outlet; a plurality of two-position three-way valve, the two-position three-way valve comprising a second two-position three-way valve; a carrying tank, the carrying tank comprising a fecal sludge outlet, and a plurality of connecting pipes, the connecting pipes comprising an air inlet pipe, a first pipe, a second pipe, an air vent pipe, and a fourth pipe. The carrying tank communicates with the fecal storage device. The air inlet pipe is connected to the air inlet of the pneumatic pressure conveyor. The first pipe is connected to the air inlet pipe. One end of the second pipe is connected to the first pipe, and the other end of the second pipe is connected to the carrying tank. The second two-position three-way valve is arranged between the air vent pipe and the fourth pie. The fourth pipe is operable to be connected to the fecal storage device.

In a class of this embodiment, the system further comprising a third pipe. A first end of the third pipe is directly or indirectly connected to the first pipe or the second pipe, and a second end of the third pipe is connected to one end of the two-position three-way valve.

In a class of this embodiment, the system further comprises a first two-position three-way valve. The first pipe is connected to the second pipe via the first two-position three-way valve, and the first end of the third pipe is connected to the first two-position three-way valve.

In a class of this embodiment, the air inlet of the pneumatic pressure conveyor is provided with an air filtration device.

In a class of this embodiment, the pipes comprise the fecal extraction pipe comprising two ends. One end of the fecal extraction pipe is connected to the top of the carrying tank, and the other end of the fecal extraction pipe is operable to be connected to the fecal storage device.

In a class of this embodiment, a check valve is arranged at a joint between the inner cavity of the carrying tank and the fecal extraction pipe.

In a class of this embodiment, a first end of the first pipe is arranged on the air inlet pipe via a pipe tee; and two ends of the first pipe are connected to two ends of the air inlet pipe, respectively.

Compared with a vehicle-mounted vacuum system for fecal sludge extraction, the system controlled by two-position three-way valves has a simple structure and a simple operation, that is, the fecal extraction and discharge by pressured air is realized by operating the two-position three-way valve and the shut-off valve. The system of the invention is in support of the fecal extraction and discharge of the closed fecal storage device by pressured air, the foul smell gas is prevented from leaking during the whole process, thereby being environmentally friendly, and the operation for the maintenance is simple. Finally, the system of the invention has a lowered requirement on the material and the processing of the carrying tank to increase the capability of continuous operation of the system and decrease the production cost.

By improving the tensile strength of the fecal storage device and the transporting capability of the pressured air, the depth for extracting the fecal sludge by the pressured air is significantly deeper than that of the vacuum truck for extracting the fecal sludge, so that conditions are created for conducting a closed mode of sludge storage and a deepening mode for the fecal storage device restricted by the terrain.

The system has a significantly simplified structure, so that the space for freely mounting the pneumatic pressure conveyor is significantly enlarged, the condition is created for fitting multiple kinds of power for the pneumatic pressure conveyor, thereby broadening the application of the invention.

In accordance with another embodiment of the invention, there is provided a system for extracting and discharging fecal sludge by pressured air controlled by shut-off valves, the system comprises: a carrying tank, a fecal extraction pipe, a fecal sludge outlet, a fecal discharge valve, an anti-overflow device, an observation window or an observation tube, a transmission shaft, a power take-off; an alarm device for warning a full-load of the fecal sludge. The system further comprises: a pneumatic pressure conveyor, the pneumatic pressure conveyor comprising an air inlet and an air outlet; pipe tees, the pipe tees comprising a first pipe tee, a second pipe tee, and a third pipe tee; a first shut-off valve; a second shut-off valve; a third shut-off valve; and connecting pipes. The air inlet of the pneumatic pressure conveyor, the pneumatic pressure conveyor, and the air outlet of the pneumatic pressure conveyor, the second pipe tee, the second shut-off valve, the third pipe tee, the first shut-off valve, and the first pipe tee are connected, respectively, to form a loop via the connecting pipes. The first pipe tee is arranged close to the air inlet of the pneumatic pressure conveyor, and one end of the first pipe tee not enclosed in the loop functions as an air inlet end of the pneumatic pressure conveyor. The second pipe tee is arranged close to the air outlet of the pneumatic pressure conveyor, and one end of the second pipe tee not enclosed in the loop is connected to the third shut-off valve. The third shut-off valve is further connected to an air vent pipe. A free end of the air vent pipe functions as an air outlet end of the system. The air outlet end of the pneumatic pressure conveyor is fixed on a rear or either side of a truck body. One end of the pipe tee connected to the pneumatic pressure conveyor not enclosed in the loop communicates with an inner cavity of the carrying tank from the top thereof via the connecting pipe. The top of the carrying tank is provided with the fecal extraction pipe communicating with the carrying tank, and the fecal sludge outlet is arranged at the bottom of the carrying tank.

In accordance with another embodiment of the invention, there is provided a system for extracting and discharging fecal sludge by pressured air controlled by shut-off valves, the system comprises: a pneumatic pressure conveyor, the pneumatic pressure conveyor comprising an air inlet and an air outlet; a plurality of shut-off valves, the shut-off valves comprising a first shut-off valve and a second shut-off valve; a carrying tank, the carrying tank comprising a fecal sludge outlet, and a plurality of connecting pipes, the connecting pipes comprising an air inlet pipe, a first pipe, and an air vent pipe. The carrying tank communicates with a fecal storage device. The air inlet pipe is connected to the air inlet of the pneumatic pressure conveyor. One end of the air vent pipe is connected to the air outlet of the pneumatic pressure conveyor, and the other end of the air vent pipe is operable to be connected with the fecal storage device. The first shut-off valve is disposed on the first pipe. One end of the first pipe is connected to the air inlet pipe, and the other end of the first pipe is connected to the carrying tank. The third shut-off valve is disposed on the air vent pipe.

In a class of this embodiment, the system comprises: a second pipe comprising two ends, and a second shut-off valve. The second shut-off valve is arranged on the second pipe; and one end of the second pipe is connected to the air vent pipe, and the other end of the second pipe is connected to the first pipe.

In a class of this embodiment, the pneumatic pressure conveyor comprises the air inlet and the air outlet; the air inlet is connected to the air inlet pipe, and the air outlet is connected to the air vent pipe.

In a class of this embodiment, the pipes comprise the fecal extraction pipe comprising two ends; one end of the fecal extraction pipe is connected to the top of the carrying tank, and the other end of the fecal extraction pipe is operable to be connected to the fecal storage device.

In a class of this embodiment, a check valve is arranged at a joint between the inner cavity of the carrying tank and the fecal extraction pipe.

In a class of this embodiment, a first end of the first pipe is arranged on the air inlet pipe via a first pipe tee; and two ends of the first pipe are connected to two ends of the air inlet pipe, respectively.

In a class of this embodiment, a first end of the second pipe is connected to the air vent pipe via a second pipe tee, and a second end of the second pipe is connected to the first pipe via a third pipe tee.

In a class of this embodiment, the carrying tank is a closed container.

In a class of this embodiment, the carrying tank is provided with an anti-overflow device, an observation widow or an observation tube, a transmission shaft, a power take-off, and an alarm device for warning a full-load of the fecal sludge.

Compared with a vehicle-mounted vacuum system for fecal sludge extraction, the system controlled by shut-off valves has a simple structure and a simple operation, that is, the fecal extraction and discharge by pressured air is realized by operating the two-position three-way valve and the shut-off valve. The system of the invention is in support of the fecal extraction and discharge of the closed fecal storage device by pressured air, the foul smelling gas is prevented from leaking during the whole process, thereby being environmentally friendly, and the operation for the maintenance is simple. Finally, the system of the invention has a lowered requirement on the material and the processing of the carrying tank to increase the capability of continuous operation of the system and decrease the production cost.

By improving the tensile strength of the fecal storage device and the transporting capability of the pressured air, the depth for extracting the fecal sludge by the pressured air is significantly deeper than that of the vacuum truck for extracting the fecal sludge, so that conditions are created for conducting a closed mode of sludge storage and a deepening mode for the fecal storage device restricted by the terrain.

The system has a significantly simplified structure, so that the space for freely mounting the pneumatic pressure conveyor is significantly enlarged, the condition is created for fitting multiple kinds of power for the pneumatic pressure conveyor, thereby broadening the application of the invention.

In accordance with still another embodiment of the invention, there is provided with a system for extracting and discharging fecal sludge by pressured air controlled by a combination of valves, the system comprises: a carrying tank; a pneumatic pressure conveyor; a two-position three-way valve; a shut-off valve; a pipe tee; a connecting pipe; control valves, the control valves comprising a two-position three-valve and a shut-off valve; at least one path controlled by the control valve for connecting an inner cavity of the carrying tank and an air inlet of the pneumatic pressure conveyor; at least one path controlled by the control valve for connecting the inner cavity of the carrying tank and an air outlet of the pneumatic pressure conveyor; and at least one path controlled by the control valve for connecting the air outlet end of the pneumatic pressure conveyor and output pressured air.

In a class of this embodiment, a connecting channel between the inner cavity of the carrying tank and an air inlet of the pneumatic pressure conveyor is formed by a series connection of a first end and a second end of the two-position three-valve, and a third port and a second port of the first pipe tee via the connecting pipe. A connecting channel between the inner cavity of the carrying tank and an air outlet of the pneumatic pressure conveyor is formed by a series connection of the second end and a third end of the two-position three-way valve, a third port and a first port of the second pipe tee via the connecting pipe. An air inlet channel of the system is formed by connecting the air inlet of the pneumatic pressure conveyor and a second port and the first port of the first pipe tee via the connecting pipe. An air outlet channel of the system is formed by connecting the air outlet of the pneumatic pressure conveyor, the first port and the second port of the second pipe tee, a first end of the shut-off valve via the connecting pipe.

In a class of this embodiment, an air outlet end of the air outlet channel is formed by the second end of the shut-off valve or by a free end of an air vent pipe connected to the second end of the shut-off valve.

In a class of this embodiment, an air outlet end of the air outlet channel is formed by the second end of the shut-off valve or by a free end of an air vent pipe connected to the second end of the shut-off valve. The connecting channel between the inner cavity of the carrying tank and the air inlet of the pneumatic pressure conveyor is formed by a series connection of a second port and a first port of the second pipe tee, a second end and the first end of the shut-off valve, and the third port and the second port of the first pipe tee via the connecting pipe. The connecting channel between the inner cavity of the carrying tank and the air outlet of the pneumatic pressure conveyor is formed by a series connection of the second port and the third port of the second pipe tee, and the third end and the first end of the two-position three-way valve via the connecting pipe. The air inlet channel of the system is formed by connecting the air inlet of the pneumatic pressure conveyor and the second port and the first port of the first pipe tee via the connecting pipe. An air outlet channel of the system is formed by connecting the air outlet of the pneumatic pressure conveyor and the first end and the second end of the two-position three-valve via the connecting pipe.

In a class of this embodiment, the air outlet end of the system is formed by the second end of the shut-off valve or by the free end of the air vent pipe connected to the second end of the shut-off valve.

In a class of this embodiment, the air inlet end of the system is formed by the first port of the first pipe tee or by a free end of an air inlet pipe connected to the first port of the first pipe tee.

In a class of this embodiment, the air inlet end of the system is provided with an air filtration device.

In a class of this embodiment, the two-position three-way valve and the shut-off valve are manual valves or automatic control valves.

In a class of this embodiment, the system further comprises an air vent hose arranged on the air outlet end, a fecal inlet pipe arranged on the carrying tank, and a fecal extraction hose arranged on one end of the fecal inlet pipe.

In a class of this embodiment, the system transports the pressured air to the fecal storage system via the air vent hose, and transports the fecal sludge from the fecal storage system to the carrying tank via the fecal extraction hose, thereby realizing the fecal sludge extraction by the pressured air.

In a class of this embodiment, the system is installed on a vehicle that is self-powered, or human-powered, or animal-powered and runs on the land, a vehicle that runs on the water surface, or a vehicle that runs on rails.

In a class of this embodiment, the carrying tank is provided with a fecal sludge outlet and a fecal discharge valve disposed on the fecal sludge outlet for controlling the opening and closing of the fecal sludge outlet.

In a class of this embodiment, the carrying tank is provided with an anti-overflow device, an observation window, observation tube, or an alarm device for warning a full-load of the fecal sludge.

In a class of this embodiment, a structure or device for unidirectional blockage of the fecal inlet pipe is arranged on the fecal inlet pipe or one end of the fecal inlet pipe inside the carrying tank.

In a class of this embodiment, the system comprises a transmission shaft and a power take-off. The pneumatic pressure conveyor employs the transmission shaft and the power take-off to obtain a driving force for a power device equipped by a transporter of the system of the system.

In a class of this embodiment, the pneumatic pressure conveyor is driven by a motor, and a power device is mounted on a transporter of the system for providing driving energy for the motor; or the pneumatic pressure conveyor is driven by the motor, and the driving energy of the motor is provided by an electric system independent to the transporter of the system.

Advantages of the invention are summarized as follows:

Compared with a vehicle-mounted vacuum system for fecal sludge extraction, the system controlled by a combination of valves has a simple structure and a simple operation, that is, the fecal extraction and discharge by pressured air is realized by operating the two-position three-way valve and the shut-off valve. The system of the invention is in support of the fecal extraction and discharge of the closed fecal storage device by pressured air, the foul smelling gas is prevented from leaking during the whole process, thereby being environmentally friendly, and the operation for the maintenance is simple. Finally, the system of the invention has a lowered requirement on the material and the processing of the carrying tank to increase the capability of continuous operation of the system and decrease the production cost.

By improving the tensile strength of the fecal storage device and the transporting capability of the pressured air, the depth for extracting the fecal sludge by the pressured air is significantly deeper than that of the vacuum truck for extracting the fecal sludge, so that conditions are created for conducting a closed mode of sludge storage and a deepening mode for the fecal storage device restricted by the terrain.

The system has a significantly simplified structure, so that the space for freely mounting the pneumatic pressure conveyor is significantly enlarged, the condition is created for fitting multiple kinds of power for the pneumatic pressure conveyor, thereby broadening the application of the invention.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a structure diagram of a system for extracting and discharging fecal sludge by pressured air controlled by two-position three-way valves in accordance with one embodiment of the invention;

FIG. 2 is a structure diagram of a system for extracting and discharging fecal sludge by pressured air controlled by shut-off valves in accordance with one embodiment of the invention;

FIG. 3 is a structure diagram of a system for extracting and discharging fecal sludge by pressured air controlled by a combination of valves in accordance with one embodiment of the invention; and

FIG. 4 is a structure diagram of a system for extracting and discharging fecal sludge by pressured air controlled by a combination of valves in accordance with one embodiment of the invention.

DETAILED DESCRIPTION OF THE EMBODIMENTS

For further illustrating the invention, experiments detailing a system for extracting and discharging fecal sludge are described below. It should be noted that the following examples are intended to describe and not to limit the invention.

Example 1

As shown in FIG. 1, a system for extracting and discharging fecal sludge by pressured air controlled by two-position three-way valves, comprises: a pneumatic pressure conveyor 1, a first two-position three-way valve 6, a second two-position three-way valve 5, a pipe tee 4, a carrying tank 33, and a plurality of connecting pipes.

The pneumatic pressure conveyor 1 is provided with an air inlet 2 and an air outlet 14. The air inlet 2 is connected to the first two-position three-way valve 6 via the pipe tee 4, the air outlet 14 is connected to the second two-position three-way valve 5, and the first two-position three-way valve 6 and the second two-position three-way valve 5 are connected to each other. That is, the first two-position three-way valve 6, the pipe tee 4, the air inlet 2 of the pneumatic pressure conveyor 1, the pneumatic pressure conveyor 1, the air outlet 14 of the pneumatic pressure conveyor 1, the second two-position three-way valve 5, a first pipe 7, an air vent pipe 20, and a third pipe 15 are connected, respectively, to form a loop. One end of an air inlet pipe 20 is connected to one port of the pipe tee 4 that is not enclosed in the loop, and the other end of the air inlet pipe 20 is an air inlet end 3. A fourth pipe 16 is connected to one port of the second two-position three-way valve 5 that is not enclosed in the loop, and a free end of the fourth pipe 16 forms an air outlet end of the system to supply air to a fecal storage device (not shown in FIG. 1) for extracting the fecal sludge by the pressured air.

Specifically, the first two-position three-way valve 6 is disposed between the first pipe 7 and the second pipe 23 for controlling air circulation therein. Preferably, one end of the first pipe 7 is disposed on the pipe tee 4 and communicates the air inlet 2 and the air inlet end 3. The second two-position three-way valve 5 is disposed between the air vent pipe 20 and the fourth pipe 16 for controlling air circulation therein. One port of the first two-position three-way valve 6 is connected to one end of the third pipe 15, and the other end of the third pipe 15 is connected to one port of the second two-position three-way valve 5.

The pneumatic pressure conveyor 1 herein is an air compressor. Also, the pneumatic pressure conveyor 1 is a pressure blower or a device being capable of pressurizing the absorbed air and input the air to a closed container. Preferably, the air inlet 2 of the pneumatic pressure conveyor 1 is provided with an air filtration device (not shown in FIG. 1) for preventing impurities in the air from entering the pneumatic pressure conveyor 1, thereby prolonging the service life of the pneumatic pressure conveyor 1.

The carrying tank 33 is used to transfer the fecal sludge or works as a closed container for temporarily storing the fecal sludge. The first two-position three-way valve 6 communicates with the carrying tank 33 through the second pipe 23. A top of the carrying tank 33 is provided with a fecal extraction pipe 24 comprising one end communicating with the carrying tank 33 for introducing the fecal sludge from the fecal storage device into the carrying tank 33 via the fecal extraction pipe 24. A bottom of the carrying tank 33 is provided with a fecal sludge outlet 25. Preferably, the top of the carrying tank 33 is provided with an air inlet interface and a fecal extraction interface, and the bottom of the carrying tank 33 is provided with a fecal discharge interface. The air inlet interface is connected to the second pipe 23 via a first interface device. The fecal extraction interface is connected to the fecal extraction pipe 24 via a second interface device. The fecal discharge interface is connected to the fecal sludge outlet 25 via a third interface device. Preferably, the fecal sludge outlet 25 is provided with a fecal discharge valve (not shown in FIG. 1) for controlling the discharge of the fecal sludge out of the carrying tank 33. Preferably, a check valve (not shown in FIG. 1) is disposed at the fecal extraction interface inside the carrying tank 33. The check valve is in a closed state during non-fecal discharge and in an open state during fecal discharge.

The carrying tank 33 is also provided with an anti-overflow device (not shown in FIG. 1), an observation window (not shown in FIG. 1), or an observation tube (not shown in FIG. 1). Preferably, the carrying tank 33 further comprises an alarm device (not shown in FIG. 1) for warning a full-load of the fecal sludge.

The carrying tank 33 is further provided with a transmission shaft (not shown in FIG. 1) and a power take-off. The pneumatic pressure conveyor 1 employs the transmission shaft and the power take-off to obtain a driving force for a power device equipped by a transporter of the system of the system.

The driving energy for the motor is provided by the power device of the transporter of the system or by an electric system independent to the transporter of the system.

The fecal sludge extraction process of the system for extracting and discharging fecal sludge by pressured air controlled by two-position three-way valves is as follows: the fecal discharge valve arranged at the fecal sludge outlet 25 of the carrying tank 33 is controlled to be at a closed state before the fecal sludge extraction. The first two-position three-way valve 6 and the second two-position three-way valve 5 are operated to allow the second pipe 15 between the first and the second two-position three-way valves 6, 5 to be in a blocked state, the second pipe 23, the first pipe 7, the pipe tee 4 to be connected, and the air vent pipe 20 and the fourth pipe 16 to be connected. The pneumatic pressure conveyor 1 is started, and the air is introduced through the air inlet end 3 of the air vent pipe 20, the pipe tee 4, and the air inlet 2 the pneumatic pressure conveyor 1 into the pneumatic pressure conveyor 1. The air is pressurized in the pneumatic pressure conveyor 1 and introduced to the fecal storage device through the air outlet 14 of the pneumatic pressure conveyor 1, the air vent pipe 20, the second two-position three-way valve 5, and the fourth pipe 16. Thus, the pressure in the fecal storage device is increased. Under the force of the high pressure in the fecal storage device, the fecal sludge therein is transported to the carrying tank 33 through the fecal extraction pipe 24 or a series connection of the fecal extraction pipe 24 and the check valve, thereby realizing the objective of extracting the fecal sludge by compress the air.

During the above fecal sludge extraction process, the fecal sludge is transferred from the fecal storage device to the carrying tank 33. The pneumatic pressure conveyor 1 operates and produces a negative pressure at the air inlet 2 and the pipe tee 4, thereby resulting in a pressure difference between the inner carrying tank 33 and the pipe tee 4. The pressure difference further drives the gas inside the carrying tank 33 to pass through the second pipe 23, the first two-position three-way valve 6, the first pipe 7, and the pipe tee 4 to the air inlet 2 of the pneumatic pressure conveyor 1, and finally enter the pneumatic pressure conveyor together with the air for participating the fecal sludge extraction by air pressure. Such a process for extracting the fecal sludge is capable of preventing the foul smelling gas from leaking out of the fecal storage device and the carrying tank 33 during the fecal sludge transferring, thereby being environmentally friendly.

Discharge of the fecal sludge by the system for extracting and discharging fecal sludge by pressured air controlled by two-position three-way valves is as follows: to discharge the fecal sludge, the first and the second two-position three-way valves 6, 5 are operated to allow the third pipe 15 to be at an open state and the first pipe 7 and the fourth pipe 16 to be at a closed state. The fecal discharge valve is opened, and the pneumatic pressure conveyor 1 is started to output pressured air to the carrying tank 33 via the air vent pipe 20, the second two-position three-way valve 5, the third pipe 15, the first two-position three-way valve 6, and the second pipe 23, respectively, so that the pressure inside the carrying tank 33 increases, and the fecal sludge inside the carrying tank 33 is driven out through the fecal discharge valve and the fecal sludge outlet 25. Such a process realizes a forced and fast discharge of fecal sludge.

The system for extracting and discharging fecal sludge by pressured air controlled by two-position three-way valves is installed on a vehicle that is self-powered, or human-powered, or animal-powered and runs on the land, or a vehicle that runs on the water surface, or a vehicle that runs on rails.

The system for extracting and discharging fecal sludge by pressured air controlled by two-position three-way valves of the invention is capable of improving the tensile strength of the fecal storage device and the transporting capability of the pressured air of the pneumatic pressure conveyor to increase the depth for extracting the fecal sludge by the pressured air. Furthermore, the invention has a simple structure and creates conditions for conducting a closed mode of sludge storage and a deepening mode for the fecal storage device restricted by the terrain. Finally, the system of the invention has a lowered requirement on the material and the processing of the carrying tank 33 to increase the capability of continuous operation of the extraction and discharge of the fecal sludge.

The invention has a simple structure and realizes processes of extraction and forced discharge of the fecal sludge by controlling the two-position three-way valves. The operation is simple and employs the pressured air to extract the fecal sludge, thereby preventing the foul smelling gas from leaking. Thus, the system of the invention is environmentally friendly and has a simple maintenance and relatively low production cost.

The invention has a significantly simplified structure, so that the space for freely mounting the pneumatic pressure conveyor 1 is significantly enlarged, the condition is created for fitting multiple kinds of power for the pneumatic pressure conveyor 1, thereby broadening the application of the invention.

Example 2

As shown in FIG. 2, a system for extracting and discharging fecal sludge by pressured air controlled by shut-off valves, the system comprises: a pneumatic pressure conveyor 1, a plurality of shut-off valves, a plurality of pipe tees, a carrying tank 33, and connecting pipes.

The pneumatic pressure conveyor 1 is provided with an air inlet 2 and an air outlet 14. The air inlet 2 is connected to a first shut-off valve 21 via a first pipe tee 17, the air outlet 14 is connected to a second shut-off valve 34 via a second pipe tee 18, and the first shut-off valve 21 and the second shut-off valve 34 are connected to each other. That is, the air inlet 2 of the pneumatic pressure conveyor 1, the pneumatic pressure conveyor 1, the air outlet 14 of the pneumatic pressure conveyor 1, the second shut-off valve 34, the second pipe 23, the first shut-off valve 21, and the first pipe 7 are connected, respectively, to form a loop. One end of an air inlet pipe 20 is connected to one port of a first pipe tee 17 that is not enclosed in the loop, and the other end of the air inlet pipe 20 is an air inlet end 3 for supplying the air to the air inlet 2, thereby introducing the air to the pneumatic pressure conveyor 1. One end of a third shut-off valve 35 is connected to one port of a second pipe tee 18 not enclosed in the loop, and the other end of the third shut-off valve 35 is connected to an air vent pipe, and a fecal storage device (not shown in FIG. 2) for extracting the fecal sludge by the pressured air.

Specifically, the first shut-off valve 21 is installed on the first pipe 7 for controlling the air circulation inside the first pipe 7. Preferably, a first end of the first pipe 7 is installed on the air inlet pipe 20 via the first pipe tee 17 to communicate with the air inlet 2 and the air inlet end 3. The third shut-off valve 35 is installed on the air vent pipe 20 for controlling the air circulation inside the air vent pipe 20. The second shut-off valve 34 and the second shut-off valve 35 are installed in parallel, and the second shut-off valve 34 is installed on the second pipe 23. A first end of the second pipe 23 is connected to the air vent pipe 20 via the second pipe tee 18, and a second end of the second pipe 23 is connected to a second end of the first pipe 7 via the third pipe tee 19.

The pneumatic pressure conveyor 1 herein is an air compressor. Also, the pneumatic pressure conveyor 1 is a pressure blower or a device being capable of pressurizing the absorbed air and input the air to a closed container. Preferably, the air inlet 2 of the pneumatic pressure conveyor 1 is provided with an air filtration device (not shown in FIG. 1) for preventing impurities in the air from entering the pneumatic pressure conveyor 1, thereby prolonging the service life of the pneumatic pressure conveyor 1.

The number of the shut-off valves is not limited to three. A plurality of the shut-off valves can be installed on the second pipe 23, the first pipe 7, and the air vent pipe 20.

The carrying tank 33 is used to transfer the fecal sludge or works as a closed container for temporarily storing the fecal sludge. A third end of the third pipe tee 19 communicates with the carrying tank 33 through a pipe. A top of the carrying tank 33 is provided with a fecal extraction pipe 24 comprising one end communicating with the carrying tank 33 and the other end connected with a fecal storage device. A bottom of the carrying tank 33 is provided with a fecal sludge outlet 25. Preferably, the top of the carrying tank 33 is provided with an air inlet interface and a fecal extraction interface, and the bottom of the carrying tank 33 is provided with a fecal discharge interface. The air inlet interface is connected to the first pipe 7 via a first interface device. The fecal extraction interface is connected to the fecal extraction pipe 24 via a second interface device. The fecal discharge interface is connected to the fecal sludge outlet 25 via a third interface device. Preferably, the fecal sludge outlet 25 is provided with a fecal discharge valve (not shown in FIG. 2) for controlling the discharge of the fecal sludge out of the carrying tank 33. Preferably, a check valve (not shown in FIG. 2) is disposed at the fecal extraction interface inside the carrying tank 33. The check valve is in a closed state during non-fecal discharge and in an open state during fecal discharge.

The carrying tank 33 is also provided with an anti-overflow device (not shown in FIG. 2), an observation window (not shown in FIG. 2), or an observation tube (not shown in FIG. 2). Preferably, the carrying tank 33 further comprises an alarm device (not shown in FIG. 2) for warning a full-load of the fecal sludge.

The carrying tank 33 is further provided with a transmission shaft (not shown in FIG. 2) and a power take-off. The pneumatic pressure conveyor 1 employs the transmission shaft and the power take-off to obtain a driving force for a power device equipped by a transporter of the system of the system.

The driving energy for the motor is provided by the power device of the transporter of the system or by an electric system independent to the transporter of the system.

The fecal sludge extraction process of the system for extracting and discharging fecal sludge by pressured air controlled by shut-off valves is as follows: the fecal discharge valve arranged at the fecal sludge outlet 25 of the carrying tank 33 is controlled to be at a closed state before the fecal sludge extraction. The first, second, and third shut-off valves 21, 34, 35 are operated to allow the first and the third shut-off valves 21, to be in a open state, and the second shut-off valve 34 to be in a closed state. The pneumatic pressure conveyor 1 is started, and the air is introduced through the air inlet end 3 of the air vent pipe 20 into the pneumatic pressure conveyor 1. The air is pressurized in the pneumatic pressure conveyor 1, and introduced to the fecal storage device (not shown in FIG. 1) to via the air outlet 14 of the pneumatic pressure conveyor 1, the air vent pipe 20, and the third shut-off valve 35. As the fecal storage device is a closed container, the pressure in the fecal storage device is increased. Under the force of the high pressure in the fecal storage device, the fecal sludge therein is transported to the carrying tank 33 through the fecal extraction pipe 24 or a series connection of the fecal extraction pipe 24 and the check valve, thereby realizing the objective of extracting the fecal sludge by compress the air.

During the above fecal sludge extraction process, the fecal sludge is transferred from the fecal storage device to the carrying tank 33. The pneumatic pressure conveyor 1 operates and produces a negative pressure at the air inlet 2 and the first pipe tee 17, thereby resulting in a pressure difference between the inner carrying tank 33 and the first pipe tee 17. The pressure difference further drives the gas inside the carrying tank 33 to pass through the first pipe 7, the first shut-off valve 21, the first pipe 7, and air inlet pipe to the air inlet 2 of the pneumatic pressure conveyor 1, and finally enter the pneumatic pressure conveyor together with the air for participating the fecal sludge extraction by air pressure. Such a process for extracting the fecal sludge is capable of preventing the foul smelling gas from leaking out of the fecal storage device and the carrying tank 33 during the fecal sludge transferring, thereby being environmentally friendly.

Discharge of the fecal sludge by the system for extracting and discharging fecal sludge by pressured air controlled by shut-off valves is as follows: to discharge the fecal sludge, the first, second, and third shut-off valves 21, 34, 35 are operated to allow the first and the third shut-off valves 21, 35 to be at a closed state, and the second shut-off valve 34 to be at an open state. The fecal discharge valve is opened, and the pneumatic pressure conveyor 1 is started to output pressured air to the carrying tank 33 via the second pipe 23 and the second shut-off valve 34, so that the pressure inside the carrying tank 33 increases, and the fecal sludge inside the carrying tank 33 is driven out through the fecal discharge valve and the fecal sludge outlet 25. Such a process realizes a forced and fast discharge of fecal sludge.

The system for extracting and discharging fecal sludge by pressured air controlled by shut-off valves is installed on a vehicle that is self-powered, or human-powered, or animal-powered and runs on the land, or a vehicle that runs on the water surface, or a vehicle that runs on rails.

The system for extracting and discharging fecal sludge by pressured air controlled by shut-off valves of the invention is capable of improving the tensile strength of the fecal storage device and the transporting capability of the pressured air of the pneumatic pressure conveyor, so that the depth for extracting the fecal sludge by the pressured air is significantly deeper than that of the vacuum truck for extracting the fecal sludge, thereby creating conditions for conducting a closed mode of sludge storage and a deepening mode for the fecal storage device restricted by the terrain. Finally, the system of the invention has a lowered requirement on the material and the processing of the carrying tank 33 to increase the capability of continuous operation of the extraction and discharge of the fecal sludge.

The invention has a significantly simplified structure, so that the space for freely mounting the pneumatic pressure conveyor 1 is significantly enlarged, the condition is created for fitting multiple kinds of power for the pneumatic pressure conveyor 1, thereby broadening the application of the invention.

Example 3

As shown in FIG. 3, a system for extracting and discharging fecal sludge by pressured air controlled by a combination of valves, the system comprises: a pneumatic pressure conveyor 1, a two-position three-way valve 26, a shut-off valve 22, a first pipe tee 4, a second pipe tee 30, a carrying tank 12, connecting pipes 7, 27, 28, 15, 30, 31, air inlet pipe 20, air vent pipe, a fecal inlet pipe 32, and a fecal sludge outlet 25.

A connecting channel between an inner cavity of the carrying tank 12 and an air inlet of the pneumatic pressure conveyor 1 is formed by a series connection of a first end and a second end of the two-position three-valve 26, and a third port and a second port of the first pipe tee 4 via the connecting pipe. The first end of the two-position three-way valve 26 is connected to the third port of the first pipe tee 4 via the connecting pipe 7. A second port of the first pipe tee 4 is connected to the air inlet 2 of the pneumatic pressure conveyor 1 via the connecting pipe 30. The second end of the two-position three-valve 26 is connected to the inner cavity of the carrying tank 12 via the connecting pipe 27.

A connecting channel between an inner cavity of the carrying tank 12 and an air outlet end 14 of the pneumatic pressure conveyor 1 is formed by a series connection of a second end and the third end of the two-position three-valve 26, and a third port and the first port of the second pipe tee 30 via the connecting pipe. The connecting pipe 27 is connected to the second end of the two-position three-valve 26. The third end of the two-position three-valve 26 is connected to the third port of the second pipe tee 30 via the connecting pipe 15. The first port of the second pipe tee 30 is connected to the air outlet end 14 of the pneumatic pressure conveyor 1 via the connecting pipe 28.

An air vent channel is formed by the air outlet end 14 of the pneumatic pressure conveyor 1, the connecting pipe 28, the first port and the second port of the second pipe tee 18, and a first end of the shut-off valve 22. The connecting pipe 28 is connected to the air outlet end 14 of the pneumatic pressure conveyor 1 and the first port of the second pipe tee 18. The second port of the second pipe tee 18 is connected to the first end of the shut-off valve 31 via the connecting pipe 31.

Preferably, the air inlet end 2 of the pneumatic pressure conveyor 1 is connected to the air inlet pipe 20 via the second port and the first port of the first pipe tee 4. A free end of the air inlet pipe 20 forms an air inlet end of the system.

The pneumatic pressure conveyor 1 herein is an air compressor. Also, the pneumatic pressure conveyor 1 is a pressure blower or a device being capable of pressurizing the absorbed air and input the air to a closed container.

Preferably, the air inlet 2 of the pneumatic pressure conveyor 1 is provided with an air filtration device (not shown in FIG. 3) for preventing impurities in the air from entering the pneumatic pressure conveyor 1, thereby prolonging the service life of the pneumatic pressure conveyor 1.

The two-position three-valve 26 and the shut-off valve 22 are manual valves.

Preferably, the two-position three-valve 26 and the shut-off valve 22 are electric valves or pneumatic valves.

Preferably, the second end of the shut-off valve 22 is connected to the air vent pipe 20. A free end of the air vent pipe 20 forms the air outlet end of the system.

Preferably, the air outlet end of the system is provided with an air vent hose.

A top of the carrying tank 12 is provided with the fecal inlet pipe 32 communicating with the inner cavity of the carrying tank 12. A bottom of the carrying tank 12 is provided with a fecal sludge outlet 25. A fecal discharge valve (not shown in FIG. 3) is arranged on the fecal sludge outlet 25 for controlling the open and the close of the fecal sludge outlet 25.

Preferably, a suspension end of the fecal inlet pipe 32 is provided with a fecal extraction hose.

Preferably, the carrying tank 12 is provided with the fecal inlet pipe 32 or one end of the fecal inlet pipe 32 arranged inside the carrying tank 12 is provided with a structure or device for unidirectional blockage of the fecal inlet pipe 32.

The structure or device for unidirectional blockage is a check valve or a gravity valve (not shown in FIG. 3).

Preferably, the carrying tank 12 is also provided with an anti-overflow device, an observation window, or an observation tube (not shown in FIG. 3).

The system is arranged on a transporter of the system (not shown in FIG. 3).

The transporter of the system is a vehicle that is human-powered or animal-powered and runs on the land, or a vehicle that runs on the water surface, or a vehicle that runs on rails (not shown in FIG. 3).

Preferably, the transporter of the system is a self-powered device being capable of running on the land (not shown in FIG. 3).

The carrying tank 12 is further provided with a transmission shaft (not shown in FIG. 1) and a power take-off. The pneumatic pressure conveyor 1 employs the transmission shaft and the power take-off to obtain a driving force for a power device equipped by a transporter of the system of the system (not shown in FIG. 3).

The pneumatic pressure conveyor 1 is driven by a motor (not shown in FIG. 3).

Preferably, electric power for driving the motor of the pneumatic pressure conveyor 1 is provided by a power device (not shown in FIG. 3) equipped by the transporter of the system of the system.

Preferably, the electric power of the motor of the pneumatic pressure conveyor 1 is provided by an electric power system (not shown in FIG. 3) that is independent to the transporter of the system, such as a power socket close to the fecal storage device.

Example 4

As shown in FIG. 4, a system for extracting and discharging fecal sludge by a combination of valves, which is different from Example 3 in that: an inner cavity of the carrying tank 12 is connected to a second port and the first port of the second pipe tee 18, a second end and a first end of the shut-off valve 22, a first pipe tee 4, and connecting pipes 27, 7, 29, 30, and an air inlet of a pneumatic pressure device 1, respectively. The second port of the second pipe tee 18 communicates with the inner cavity of the carrying tank 12 via the connecting pipe 27; the first port of the second pipe tee 18 is connected to the second end of the shut-off valve 22 via the connecting pipe 7; the first end of the shut-off valve 22 is connected to the third port of the first pipe tee 4 via the connecting pipe 29; and the second port of the first pipe tee 4 is connected to the air inlet 2 of the pneumatic pressure conveyor 1 via the connecting pipe 30, thereby forming a connecting channel of the carrying tank 12, the second pipe tee 18, the shut-off valve 22, a first pipe tee 4, and the air inlet 2 of the pneumatic pressure conveyor 1.

The inner cavity of the carrying tank 12 communicates with the second port and the third port of the second pipe tee 18, the third end and the first end of the two-position three-valve 26, connecting pipes 27, 15, 28, the air outlet end 14 of the pneumatic pressure conveyor 1. The second port of the second pipe tee 18 communicates with the inner cavity of the carrying tank 12 via the connecting pipe 27; the third port of the second pipe tee 18 communicates with the third end of the two-position three-valve 26 via the connecting pipe 15; and the first end of the two-position three-valve 26 communicates with the air outlet end 14 of the pneumatic pressure conveyor 26 via the connecting pipe 28, thereby forming a connecting channel of the carrying tank 12, a second pipe tee 18, a two-position three-valve 26, and the air outlet end 14 of the pneumatic pressure conveyor 1.

An air outlet channel is formed by connecting the air outlet end 14 of the pneumatic pressure conveyor 1, the connecting pipe 28, a first end and the second end of the two-position three-valve 26, respectively. The connecting pipe 28 communicates with the air outlet end of the pneumatic pressure conveyor 1 and the first port of the second pipe tee 18.

Preferably, the second end of the two-position three-valve 26 is connected to the air vent pipe 20, and a free end of the air vent pipe 20 forms an air outlet end of the system.

The process for extracting the fecal sludge by the system is as follows: the fecal sludge outlet 25 of the carrying tank 12 is operated to be in a closed state before the fecal sludge extraction. The air vent hose and the fecal extraction hose are connected to the fecal extraction interface and the air vent interface of the fecal storage device, respectively. The two-position three-way valve 26 is operated to communicate with the inner cavity of the carrying tank 12. The first pipe tee 4 communicates with the air inlet 2 of the pneumatic pressure conveyor 1, and the channel between the third end of the two-position three-way valve 26 and the third port of the second pipe tee 18 is in a blocked state. The shut-off valve 22 is operated to allow a channel formed by the air outlet end 14 of the pneumatic pressure conveyor 1, the second pipe tee 18, and the air outlet end of the system is in an open state. The pneumatic pressure conveyor 1 is started and employs the transmission shaft and the power take-off to obtain a driving force for a power device equipped by a transporter of the system of the system. Or the pneumatic pressure conveyor 1 is driven by a motor, and the electric power for driving the motor is provided by the power device of the transporter of the system or by an electric system independent to the transporter of the system.

The pneumatic pressure conveyor 1 is started to introduce the air through the air inlet end of the air inlet pipe 20, the first pipe tee 4, and the air inlet 2 of the pneumatic pressure conveyor 1, and into the pneumatic pressure conveyor 1. The air is pressurized in the pneumatic pressure conveyor 1 and is transported to the fecal storage device via the air outlet 14 of the pneumatic pressure conveyor 1, the connecting pipe 28, the second pipe tee 18, the connecting pipe 31, the shut-off valve 22, the air vent pipe 20, the air outlet end, and the air vent hose, so that the pressure in the fecal storage device is increased. Under the increased pressure, the fecal sludge is transported from the fecal storage device to the carrying tank 12 via the fecal extraction hose, the fecal inlet pipe 32 of the carrying tank 12, or and the structure or device for unidirectional blockage, such as the check valve, thereby realizing the fecal extraction by the pressured air. The process is observable by the observation window or the observation tube, or the alarm is triggered by a full-load of the fecal sludge in the carrying tank.

After the fecal extraction process, the air vent hose and the fecal extraction hose are separated from the air vent interface and the fecal extraction interface, respectively, and the fecal sludge is transferred from the fecal storage device by the transporter of the system.

During the fecal sludge extraction, the fecal sludge is transferred from the fecal storage device to the carrying tank 12, and a negative pressure is produced in the air inlet 2 and the first pipe tee 4 by the pneumatic pressure device 1, so that a pressure difference exists between the inner cavity of the carrying tank 12 and the first pipe tee 4. The pressure difference drive the air in the carrying tank 12 to pass through the connecting pipe 27, the two-position three-way valve 26, the connecting pipe 7, the first pipe tee 4, and the connecting pipe 30, and the air inlet 2 to enter the pneumatic pressure device 1, and finally to participate in the fecal sludge extraction by the air pressure together with the air in the pneumatic pressure device 1. Such a process of fecal sludge extraction prevents the foul smelling gas from leaking out of the fecal storage device and the carrying tank 33 during the fecal sludge transferring, thereby being environmentally friendly. A flow channel for the air in the carrying tank 12 is formed, so that the air will not accumulated in the carrying tank 12 with the accumulation of the fecal sludge, the air pressure in the carrying tank 12 is prevented from increasing, which otherwise obstructing the fecal sludge extraction.

The process for discharging the fecal sludge by the system is as follows: during the fecal sludge extraction, the fecal discharge valve is operated to be at an open state, the two-position three-way valve 26 is operated to communicate with the inner cavity of the carrying tank 12. The path between the first pipe tee 4 and the air inlet 2 of the pneumatic pressure conveyor 1 is in a blocked state. Paths among the inner cavity of the carrying tank 12, the third end of the two-position three-way valve 26 and the third port of the second pipe tee 18, and the air outlet end 14 of the pneumatic pressure conveyor 1 are in an open state. The shut-off valve 22 is operated to allow the air outlet end 14 of the pneumatic pressure conveyor 1, the second pipe tee 18, and the air outlet end of the system to be at a close state.

The pneumatic pressure conveyor 1 is started, and the pressured air output from the pneumatic pressure conveyor 1 passes through the connecting pipe 28, the second pipe tee 18, the connecting pipe 15, the two-position three-way valve 26, and the connecting pipe 27, respectively, to enter the carrying tank 12. Because the structure or device for unidirectional blockage is arranged on the interface inside the carrying tank 12, the inner cavity of the carrying tank 12 is a closed structure. The pressured air output from the pneumatic pressure conveyor 1 results in an increased air pressure inside the carrying tank 12, so that the fecal sludge is fast discharged out of the carrying tank 2 via the fecal discharge valve and the fecal sludge outlet 25. Such a process realizes a forced and fast discharge of fecal sludge.

The process for extracting the fecal sludge by the system of Example 4 is different from that of the system of Example 3 in that:

During the fecal sludge extraction, the shut-off valve 22 is operated to communicate with the inner cavity of the carrying tank 12, and the path between the first pipe tee 4 and the air inlet 2 of the pneumatic pressure conveyor 1 is at an open state. The two-position three-way valve 26 is operated, the paths among the air outlet end 14 of the pneumatic pressure conveyor 1, the two-position three-way valve 26, the second pipe tee 18, and the carrying tank 12 are in a blocked state; and the path among the air outlet end 14 of the pneumatic pressure conveyor 1, the two-position three-way valve 26, and the air outlet end of the system are in an open state, so that the pneumatic pressure conveyor 1 is started, and the fecal sludge extraction is started.

After the fecal sludge extraction, the air in the carrying tank 12 passes through the connecting pipe 27, the second pipe tee 18, the connecting pipe 7, the shut-off valve 22, and the first pipe tee 4 to reach the air inlet 2 of the pneumatic pressure conveyor 1, thereby an air circulation path is formed.

The process for discharging the fecal sludge by the system of Example 4 is different from that of the system of Example 3 in that:

During the fecal sludge extraction, the two-position three-way valve 26 is operated, paths among the air outlet end 14 of the pneumatic pressure conveyor 1, the two-position three-way valve 26, and the air outlet end of the system are in a close state; and paths among the inner cavity of the carrying tank 12, the second pipe tee 18, the two-position three-way valve 26, and the air outlet end 14 of the pneumatic pressure conveyor 1 are in an open state. The shut-off valve 22 is operated, so that paths among the inner cavity of the carrying tank 12, the shut-off valve 22, the first pipe tee 4, and the air inlet 2 of the pneumatic pressure conveyor 1 are disconnected. Thus, the pneumatic pressure conveyor 1 is started, and a forced and fast discharge of fecal sludge is realized.

The system for extracting and discharging fecal sludge by pressured air controlled by a combination of valves of the invention is capable of improving the tensile strength of the fecal storage device and the transporting capability of the pressured air of the pneumatic pressure conveyor 1, so that the depth for extracting the fecal sludge by the pressured air is significantly deeper than that of the vacuum truck for extracting the fecal sludge, thereby creating conditions for conducting a closed mode of sludge storage and a deepening mode for the fecal storage device restricted by the terrain.

The system of the invention has a simple structure and lowered requirement on the material and the processing of the carrying tank to increase the capability of continuous operation of the extraction and discharge of the fecal sludge.

The two-position three-valve and the shut-off valves are operated to realize the fecal extraction and discharge. The system of the invention has a simple operation, no leakage of the foul smelling gas, simple maintenance, and relatively low production cost, and is environmentally friendly.

The invention has a significantly simplified structure, so that the space for freely mounting the pneumatic pressure conveyor is significantly enlarged, the condition is created for fitting multiple kinds of power for the pneumatic pressure conveyor, thereby broadening the application of the invention.

While particular embodiments of the invention have been shown and described, it will be obvious to those skilled in the art that changes and modifications may be made without departing from the invention in its broader aspects, and therefore, the aim in the appended claims is to cover all such changes and modifications as fall within the true spirit and scope of the invention. 

The invention claimed is:
 1. A system for extracting and discharging fecal sludge, the system comprising: a) a truck body, the truck body comprising a rear and two sides; b) a carrying tank, the carrying tank comprising an inner cavity, a top, and a bottom comprising a fecal sludge outlet; c) a fecal extraction pipe; d) a fecal discharge valve; e) an observation widow or an observation tube; f) an anti-overflow device; g) a transmission shaft; h) a power take-off; i) an alarm device, the alarm device operating to warn a full-load of the fecal sludge; j) a pneumatic pressure conveyor, the pneumatic pressure conveyor comprising an air inlet and an air outlet; k) a pipe tee; l) a first two-position three-way valve; m) a second two-position three-way valve; and n) a plurality of connecting pipes; wherein the pneumatic pressure conveyor, the air inlet thereof, the air outlet thereof, the pipe tee, the second two-position three-way valve, and the first two-position three-way valve are connected via the connecting pipes to form a loop; the pipe tee is disposed close to the air inlet of the pneumatic pressure conveyor, and one port of the pipe tee not enclosed in the loop functions as an air inlet end of the pneumatic pressure conveyor; the second two-position three-way valve is disposed close to the air outlet of the pneumatic pressure conveyor, and one end of the second two-position three-way valve not enclosed in the loop is connected to an air vent pipe; a free end of the air vent pipe functions as an air outlet end of the pneumatic pressure conveyor; and the air outlet end of the pneumatic pressure conveyor is fixed on the rear or either side of the truck body; the air outlet end of the pneumatic pressure conveyor is connected to the air vent pipe; one end of the first two-position three-way valve not enclosed in the loop communicates with the inner cavity of the carrying tank from the top thereof via the connecting pipe; and the top of the carrying tank is provided with the fecal extraction pipe communicating with the carrying tank, and the fecal sludge outlet is arranged at the bottom of the carrying tank.
 2. A system for extracting and discharging fecal sludge, the system comprising: a) a pneumatic pressure conveyor, the pneumatic pressure conveyor comprising an air inlet and an air outlet; b) a plurality of shut-off valves, the shut-off valves comprising a first shut-off valve and a third shut-off valve; c) a carrying tank, the carrying tank comprising a fecal sludge outlet; and d) a plurality of connecting pipes, the connecting pipes comprising an air inlet pipe, a first pipe, and an air vent pipe; wherein the carrying tank communicates with a fecal storage device; the air inlet pipe is connected to the air inlet of the pneumatic pressure conveyor; one end of the air vent pipe is connected to the air outlet of the pneumatic pressure conveyor, and the other end of the air vent pipe is connected with the fecal storage device; the first shut-off valve is disposed on the first pipe; one end of the first pipe is connected to the air inlet pipe, the other end of the first pipe is connected to the carrying tank; and the third shut-off valve is disposed on the air vent pipe.
 3. The system of claim 2, further comprising: a second pipe comprising two ends, and a second shut-off valve; wherein the second shut-off valve is arranged on the second pipe; and one end of the second pipe is connected to the air vent pipe, and the other end of the second pipe is connected to the first pipe.
 4. The system of claim 2, wherein the pneumatic pressure conveyor comprises the air inlet and the air outlet; the air inlet is connected to the air inlet pipe, and the air outlet is connected to the air vent pipe.
 5. The system of claim 2, wherein the connecting pipes comprise a fecal extraction pipe comprising two ends; one end of the fecal extraction pipe is connected to the top of the carrying tank, and the other end of the fecal extraction pipe is connected to the fecal storage device.
 6. The system of claim 5, wherein a check valve is arranged at a joint between the inner cavity of the carrying tank and the fecal extraction pipe.
 7. The system of claim 2, wherein a first end of the first pipe is arranged on the air inlet pipe via a first pipe tee; and two ends of the first pipe are connected to two ends of the air inlet pipe, respectively.
 8. The system of claim 2, wherein a first end of the second pipe is connected to the air vent pipe via a second pipe tee, and a second end of the second pipe is connected to the first pipe via a third pipe tee.
 9. The system of claim 2, wherein the carrying tank is a closed container.
 10. The system of claim 2, wherein the carrying tank is provided with an anti-overflow device, an observation widow or an observation tube, a transmission shaft, a power take-off, and an alarm device for warning a full-load of the fecal sludge.
 11. A system for extracting and discharging fecal sludge, the system comprising: a) a carrying tank; b) a pneumatic pressure conveyor; c) a pipe tee; d) a connecting pipe; e) control valves, the control valves comprising a two-position three-valve and a shut-off valve; f) at least one path controlled by the control valves for connecting an inner cavity of the carrying tank and an air inlet of the pneumatic pressure conveyor; g) at least one path controlled by the control valves for connecting the inner cavity of the carrying tank and an air outlet of the pneumatic pressure conveyor; and h) at least one path controlled by the control valves for connecting the air outlet end of the pneumatic pressure conveyor and output pressured air.
 12. The system of claim 11, wherein a connecting channel between the inner cavity of the carrying tank and the air inlet of the pneumatic pressure conveyor is formed by a series connection of a first end and a second end of the two-position three-valve, and a third port and a second port of the first pipe tee via the connecting pipe; a connecting channel between the inner cavity of the carrying tank and the air outlet of the pneumatic pressure conveyor is formed by a series connection of the second end and a third end of the two-position three-way valve, a third port and a first port of the second pipe tee via the connecting pipe; an air inlet channel of the system is formed by connecting the air inlet of the pneumatic pressure conveyor and a second port and the first port of the first pipe tee via the connecting pipe; and an air outlet channel of the system is formed by connecting the air outlet of the pneumatic pressure conveyor, the first port and the second port of the second pipe tee, a first end of the shut-off valve via the connecting pipe.
 13. The system of claim 12, wherein an air outlet end of the air outlet channel is formed by the second end of the shut-off valve or by a free end of an air vent pipe connected to the second end of the shut-off valve; the connecting channel between the inner cavity of the carrying tank and the air inlet of the pneumatic pressure conveyor is formed by a series connection of a second port and a first port of the second pipe tee, a second end and the first end of the shut-off valve, and the third port and the second port of the first pipe tee via the connecting pipe; the connecting channel between the inner cavity of the carrying tank and the air outlet of the pneumatic pressure conveyor is formed by a series connection of the second port and the third port of the second pipe tee, and the third end and the first end of the two-position three-way valve via the connecting pipe; the air inlet channel of the system is formed by connecting the air inlet of the pneumatic pressure conveyor and the second port and the first port of the first pipe tee via the connecting pipe; and an air outlet channel of the system is formed by connecting the air outlet of the pneumatic pressure conveyor and the first end and the second end of the two-position three-valve via the connecting pipe.
 14. The system of claim 13, wherein the air outlet end of the system is formed by the second end of the shut-off valve or by the free end of the air vent pipe connected to the second end of the shut-off valve.
 15. The system of claim 13, wherein the air inlet of the system is formed by the first port of the first pipe tee or by a free end of an air inlet pipe connected to the first port of the first pipe tee.
 16. The system of claim 13, wherein the air inlet of the system is provided with an air filtration device; and the two-position three-way valve and the shut-off valve are manual valves or automatic control valves.
 17. The system of claim 13, wherein the carrying tank is provided with a fecal sludge outlet and a fecal discharge valve disposed on the fecal sludge outlet for controlling the opening and closing of the fecal sludge outlet.
 18. The system of claim 13, wherein the carrying tank is provided with an anti-overflow device, an observation window, observation tube, or an alarm device for warning a full-load of the fecal sludge.
 19. The system of claim 13, further comprising a transmission shaft and a power take-off; wherein the pneumatic pressure conveyor employs the transmission shaft and the power take-off to obtain a driving force for a power device equipped by a transporter of the system of the system.
 20. The system of claim 13, wherein the pneumatic pressure conveyor is driven by a motor, and a power device is mounted on a transporter of the system for providing driving energy for the motor; or the pneumatic pressure conveyor is driven by the motor, and the driving energy of the motor is provided by an electric system independent to the transporter of the system. 